Improvement in machine for sharpening the teeth of saws



UNITED STATES PATENT OEEIGE.

IIARFORD J. PERKINS, OF WILLIAMSPORT, PENNSYLVANIA, ASSIGNORTO GEORGE S. SNYDER, OF SAME PLAGE.

IMPOVEMNT IN MACHINE FOR SHARPENING THE TEETH O F SAWS.

Specification forming' part of Letters Patent No. 105,244, datedy July 12, 1870; antedated July 1, 1870.

To all whom 'it may concern:

Be it known that I, HARFORD J. PERKINS, ofthe city of Williamsport, county of Lycoming, and State of Pennsylvania, have invented Y a new and useful Improvement for Sharpening the Teeth of Straight and Circular Saws; and 1 do hereby declare the-following to be a full and correct description of the same, reference'being had to the accompanying drawings, and to the letters and figures of reference niarked thereon.

My invention consists in the construction of a machine for gumming and sharpening'v saws when in a vertical position by the use of an adjustable emery or other grinding wheel in connection with the adjustable guide B an ..1 ad us'table double-hinge clamp D, which isso -adjusted and controlled as to give the sawteeth any desired angle, and bevel eitherright lor left, or'to sharpen them square.

5 is the slotted arm H, detached from the ma-A chine. Fig. 6 is an adjustable guide and rest for the clamp and straight saws to move in and rest upon when being sharpened. Fig. 7

vis a clamp for holding a circular saw while being sharpened. Fig. 8 is a double-hinge clamp for holding and adjusting-cross-cut circular saws with bevel-edged teeth when they are being sharpened.

Like letters in all the iigures indicate the same parts.

A is an ordinary frame for supporting the several parts of the machine. B is an adjustable guide and rest, attached to the ratchetbar l? by the screw-bolt u, as shown in Fig. 1. The said guide B is elevated or let down by means ofthe pinions o o and ratchets t lv, as shown ln Fig. 3, thereby regulating the distance of the guide B from the grinding-wheel N, as shown in Fig. 1. The said guideB is also adjustable on the screw-bolt u, thereby enabling either end of said guide B to be elevated or depressed, for the purpose of adjusting-saws having teeth of different angles to the grinding-wheel N. The guide Bisconstructed with rollers e e e c e, for the purpose of facilitating the lateral movement of. the clamp' G containing the saw, as shown in Fig. 1.

E is a rotary clamping-disk, forholdiag and' supporting circular saws that are required to be sharpened square across the teeth, the saidclamping-disk having a central screw-bolt, d d, firmly fastened therein, and passing through the clamping-plate n, which plate is confined upon the saw S by the nut m on the screw d,

as shown in Figs. 4 and 7. The screw-bolt d d also projects back through the slotted arm H, where it is held by the nut on the screwbolt d, as shown in Fig. 7. The said rotary clamping-disk E is movable along the slot in the arm H, for the purpose of suiting andadjusting saws of di'erent sizes to the grinding wheel N, as shown in Fig. 4.

The slotted arm E is adjustable inue slot ted post w, and the' slot e in the-upper end of the arm H, and can "be securely fastened at any desired point by means of the screw-bolt and nut a, as shown in Fig. 4. The purpose of this post lw and device is to allow the slotted arm H to be elevated or Ldepressed,'-.so as to adjust the saw-teeth to the diminishing si'ze of the emery or grindiug'wheel."

D is an adjustab1e\double-factiig hingeclamp, for holding and adjusting erossecut circular saws that require theteeth to be'sharpened with beveled edges, thersaid hinge being constructed of two, distinct yparts and joined together by the screw-bolt t'. vThe part h of the said hinge-clamp D 'is'adjustable on the post y, as shown in Fig. 2, up and down, thereby allowing saws of various sizes to be brought in contact with the grinding-wheel N. The hinge is held securely to the post y at'any desired point by `means ofthe setscrew q. (Shown in Fig. 2.) -v

The notch 1c in part h is made in the shape of a' half-circle, for the purpose of giving to the said hinge-clamp D an up-and-down relling motion, by means of which the upper por tion of the saw, when inpositiornfor sharpening, can be thrown backward toward or forward away from the grinding-wheel N, for the 'purpose of giving the edges of the sanz-teeth any desired bevel. j

rl`he part h h of the said hin ge-clamp D turns partially on the screw-boltv5 both right and left, for the purpose of changing. the saw g thereon, thereby giving to the front edges of the saw-teeth the various bevels desired in saws used for cross-cutting. The N4'saw .g .is firmly held on the part h h by the clampingplate a and thumb-screw m,.as shownin Figs. 2 and 8.

G is an ordinary clamp for holding straight saws while being sharpened. rlhe clamp, with the saw seeurelyfastened therein, is moved laterally over the rollers e e e e e in the guide B, for the purpose of bringing each one of the sawteeth in the proper place in relation tothe grinding-wheel t0 be sharpened.

The saw-teeth, when being sharpened, Vrest firmly against the linger l, (shown in Fig. 3,) having cross-slots and set-screws for its adjustment.

N is au adjustable emery or other grinding wheel, for gumming and sharpening the teeth of saws by grinding. It is removable from its shaft X by means of a' screw-boss clamp, a a, (shown in Fig. 1,) in order to change the wheel for others that are required by the various kinds of saws, the edges of the wheels being made of any desired shape, so as to n suit the notches or serrations that give shape to the saw-teeth. The shaft X, with the grindin g-wheel thereon, is driven by a belt passing around cone-pulleys, by means of which the speed of the wheel N may be increased or diminished. The shaft X is hung on centers c c in the arms ff, which project forward from the shaft J, which turns partially on its centers, so that the grinding-wheel N can be pressed down into and raised up ont of the serrations or notches ofV the saw at will `when the wheel N is in motion,therebein g a handle, I, for that purpose. l

The shaft J, (shown in Fig. 3,) with the arms fj', rests in the jaws ttof theplate C. (Shown in Figs. 1, 2, and 4.) The said plate C is coni nected to the front part ofthe frame A by means of the thumb-screw Z. (Shown inFig. 3.) The screw Z passes through the center of the'plate C, thus acting as a swivel, thereby making the plate C adjustable on the saidv .with the grinding-wheel N thereon, are held securely at any desired angle by screwing the thumb-screw Z hard upon the front part of the frame A.

What I claim, as my invention is-- 1. The adjustable guide B, having rollers e c c e c e, connectedwith the ratchets V V, and operating in relation to the grinding-wheel N, substantially as described,and for thepurposes speciiied. 2. The slotted post w and arm H, when arranged and operating in relation to the grinding-wheel N, substantially as described.

3. The adjustable double-hinge clamp D, arranged and operating in relation to the grinding-wheel N, substantially as described, and for the purpose specified.

HARFORD J. PERKINS.

fitnessesz C. l). BREWER, t J. C. HILL. 

